Work

Projection-specific intersectional optogenetics for precise excitation and inhibition in the marmoset brain

Year: 2026

Type: article

Abstract: The primate cerebral cortex relies on long-range connections to integrate information across spatially distributed and functionally specialized areas, yet tools for selectively modulating these pathways remain limited. Here, we present an optimized intersectional viral and optogenetic strategy for precisely exciting and inhibiting projection-specific neurons in the common marmoset. Building on a mouse-to-marmoset pipeline, we first validated that optogenetic activation of inhibitory neurons (via AAV9-mDlx-ChR2) enables robust local cortical inhibition. We then combined retrograde delivery of Cre-recombinase (AAVretro-Cre) with locally injected Cre-dependent vectors encoding excitatory or inhibitory opsins (AAV8-FLEx-ChR2 or Jaws) to achieve directionally selective expression in callosal and frontoparietal pathways. Dual-opsin co-expression enabled precise stimulation or suppression of projection neurons in vivo with minimal off-target labeling. These results establish a scalable framework for projection-specific optogenetic interrogation of distributed circuits in primates, expanding the experimental toolkit for causal studies of higher-order brain function with enhanced anatomical precision and functional specificity.

Source: Cell Reports Methods

DOI: 10.1016/j.crmeth.2026.101368

Authors: Luke Shaw, Krishnan Padmanabhan, Amy Bucklaew, Jude F. Mitchell, Kuan Hong Wang

Institutions: University of Rochester Medicine, University of Rochester

Language: English

Topic: Photoreceptor and optogenetics research

Subfield: Cellular and Molecular Neuroscience

Field: Neuroscience

Domain: Life Sciences

Open Access status: gold

Estimated APC paid: $4,824

Funders: National Institutes of Health, National Eye Institute, Eunice Kennedy Shriver National Institute of Child Health and Human Development